One definition of fluffer is a person who is hired to be on the set of a porno movie whose responsibility it is to arouse the male performers before their scene. (Not a job  I would want. lol)

Thanks!
How do they  prepare him then  oral, hand, other?

These days the guys, or the actresses already booked for the shoot, are expected to keep things "ready" during downtime. The days of the fluffer are long gone.

An acronym is an abbreviation of several words in such a way that the abbreviation itself forms a word

example: scuba is an acronym which stands for
self contained underwater breathing apparatus

fluffers - no first hand knowledge but it was my understanding it was mostly an oral thing. the ps probably know more